如何使用php搜索文本文件

Question

I am trying to search in a txt file using php. It is supposed to search the txt file and display results that it got from the file.

Here is my php code:

<?php
$file = 'my file.txt';
$pattern = preg_quote($searchfor, '/');
$pattern = "/^.*$pattern.*\$/m";
if(preg_match_all($pattern, $contents, $matches)){
   echo "Found matches:
";
   echo implode("
", $matches[0]);
}
else {
   echo "No matches found";
}

Answer 1

You should use $file to read the file's contents into the $contents variable. You can use get_file_contents for that. Also, it might be useful to turn this into a function, so you can re-use it for other files and search strings:

function searchInFile($file, $searchFor) {
    $contents = get_file_contents($file);
    if ($contents === false) return array(); // no file, no match
    $pattern = preg_quote($searchfor, '/');
    $pattern = "/^.*$pattern.*\$/m";
    preg_match_all($pattern, $contents, $matches));
    return $matches[0];
}

$matches = searchInFile('my file.txt', 'concert');
if (count($matches)) {
    echo "Found matches:
" . implode("
", $matches);
} else {
    echo "No matches found";
}